Posted 08 January 2013 - 12:40 PM
You only need to pay for it with the correct sphere resources (in this case, Spirit). It can play on any eligible card. In this case, Unexpected Courage needs to be attached to a hero as its only restriction. It is not limited to a specific sphere (eg, Spirit). Being Restricted does not restrict it to the sphere that "pays" for it. It only means that a character may only have two attachments with Restricted keyword at the same time.
Edit: Apologies. Didn't see the previous answer. My web-browser is slooooooow today and hadn't loaded the entire page…. oops
"... but I do not love the bright sword for its sharpness, nor the arrow for its swiftness, nor the warrior for his glory. I love only that which they defend...." -Faramir, The Lord of the Rings, Book IV, The Window of the West)
"Since it is so likely that children will meet cruel enemies, let them at least have heard of brave knights and heroic courage." - C.S. Lewis